FOOD TEST PRACTICALS

how to prepare food samples

select the samples
grind it with water using a pestle and mortar
give the mixture a liquid consistency
pour the mixture through a filter paper lined funnel into a test tube

name for glucose test

benedicts test

benedicts test for glucose steps

half fill a beaker with water
place the beaker on a tripod over a Bunsen burner and heat the water until it boils
add 1cm sample solution to a test tube
add 1cm benedicts solution and mix
place in the water bath

color scale for benedicts test

blue-green-orange-brickred

biuret test for protein steps

add 1cm samples solution to test tube
add 1cm biuret solution
mix

biuret test color change

blue to purple

Emulsion test for lipids steps

add 1cm sample solution to test tube
add 2cm of ethanol to the sample
gently shake
add 2cm of distilled water

emulsion test effect

milky-white emulsion forms